19168173990 has 64 divisors (see below), whose sum is σ = 58417297920. Its totient is φ = 4381296480.

The previous prime is 19168173971. The next prime is 19168174007. The reversal of 19168173990 is 9937186191.

It is a happy number.

19168173990 is a `hidden beast` number, since 191 + 68 + 1 + 7 + 399 + 0 = 666.

It is a super-2 number, since 2×19168173990² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5069056 + ... + 5072835.

It is an arithmetic number, because the mean of its divisors is an integer number (912770280).

Almost surely, 2^19168173990 is an apocalyptic number.

19168173990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19168173990 is an abundant number, since it is smaller than the sum of its proper divisors (39249123930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19168173990 is a wasteful number, since it uses less digits than its factorization.

19168173990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141914 (or 10141908 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 19168173990 in words is "nineteen billion, one hundred sixty-eight million, one hundred seventy-three thousand, nine hundred ninety".